TiAl 基合金の微視組織と結晶構造に及ぼす Sn 添加の影響

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Microstructures, mechanical properties, and crystal structures of Ti-(50-52)mol%Al alloys containing Sn up to 5mol% as a third element have been studied by using an optical microscope, a transmission electron microscope, a micro-Vickers hardness tester, and an X-ray diffractometer. Results obtained are as follows : The amount of Ti_3Al(α_2) phase existing in as-cast alloys was decreased by addition of Sn and it disappeared by an annealing for 604.8ks at 1273K. But the Ti_3Sn phase formed in the cast alloys containings Sn did not disappear by the annealing. The Ti_6Sn_5 phase was formed in the Ti-50mol%Al-5mol%Sn alloy by the annealing. Both of the lattice parameter c and the axial ratio c/a of the L1_0-type Al-rich intermetallic compound TiAl(γ phase) increased with increasing Sn content. Tin atoms in the γ phase occupy predominantly in the Ti site. The amount of mutual exchanges of Ti and Al atoms in lattice sites increased with increasing Sn content in the γ phase.
社団法人日本鉄鋼協会の論文
1994-10-01